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b/Cargo.toml @@ -2,7 +2,11 @@ members = ["crates/backend", "crates/frontend", "crates/common"] [workspace.package] -name = "achievements" version = "0.1.0" authors = ["Asger Juul Brunshøj "] edition = "2021" + +[workspace.dependencies] +serde = { version = "1", features = ["derive"] } +common = { path = "crates/common" } +uuid = { vserion = "1.3", features = ["serde", "v4"] } diff --git a/crates/backend/Cargo.toml b/crates/backend/Cargo.toml index 236f41b..bc0c055 100644 --- a/crates/backend/Cargo.toml +++ b/crates/backend/Cargo.toml @@ -5,3 +5,15 @@ authors.workspace = true edition.workspace = true [dependencies] +serde.workspace = true +axum = { version = "0.6", features = ["ws", "headers"] } +serde_json = "1" +tokio = { version = "1", features = ["full"] } +tracing = "0.1" +tracing-subscriber = "0.3" +common.workspace = true +thiserror = "1.0.40" +tower = "0.4.13" +uuid.workspace = true +tower-http = { version = "0.4.0", features = ["fs", "trace"] } +tokio-stream = { version = "0.1.14", features = ["sync"] } diff --git a/crates/backend/src/main.rs b/crates/backend/src/main.rs index f328e4d..382458a 100644 --- a/crates/backend/src/main.rs +++ b/crates/backend/src/main.rs @@ -1 +1,275 @@ -fn main() {} +use axum::extract::ws::Message; +use axum::extract::ws::WebSocket; +use axum::extract::WebSocketUpgrade; +use axum::headers; +use axum::http::StatusCode; +use axum::response::IntoResponse; +use axum::routing::get; +use axum::routing::post; +use axum::Extension; +use axum::Json; +use axum::Router; +use axum::TypedHeader; +use common::Achievement; +use common::CreateAchievement; +use common::DeleteAchievement; +use serde::Deserialize; +use serde::Serialize; +use std::net::SocketAddr; +use std::sync::Arc; +use std::time::Duration; +use tokio::fs; +use tokio_stream::StreamExt; +use tower::ServiceBuilder; +use tower_http::trace::DefaultMakeSpan; +use tower_http::trace::TraceLayer; + +const APP_STATE_FILE: &str = "achievements.json"; + +type SharedState = Arc>; +struct SharedStateParts { + app_state: AppState, + watcher_tx: tokio::sync::watch::Sender, +} + +#[tokio::main] +async fn main() { + tracing_subscriber::fmt::init(); + + let init_app_state = match AppState::read_state().await { + Ok(state) => state, + Err(AppStateReadError::FileReadError(_)) => { + tracing::info!( + "Could not load previous state from {}. Creating new default state.", + APP_STATE_FILE + ); + AppState::default() + } + Err(e) => panic!("Unexpected error: {:?}", e), + }; + let (app_state_watch_tx, app_state_watch_rx) = tokio::sync::watch::channel(init_app_state.clone()); + let app_state: SharedState = Arc::new(tokio::sync::RwLock::new(SharedStateParts { + app_state: init_app_state, + watcher_tx: app_state_watch_tx, + })); + + let (shutdown_tx, mut shutdown_rx) = tokio::sync::watch::channel(false); + tokio::spawn(async move { + shutdown_signal().await; + shutdown_tx.send(true).unwrap(); + }); + + // Start a separate Tokio task for periodically saving the app state + let save_task = { + let app_state = Arc::clone(&app_state); + let mut shutdown_rx = shutdown_rx.clone(); + tokio::spawn(async move { + loop { + tokio::select! { + _ = tokio::time::sleep(Duration::from_secs(10 * 60)) => { + tracing::debug!("Saving state."); + let lock = app_state.write().await; + if let Err(err) = lock.app_state.write_state().await { + tracing::error!("Failed to write app state: {err}"); + } + } + _ = shutdown_rx.changed() => { + tracing::info!("Stopping save task."); + break; + } + } + } + }) + }; + + let server_task = { + let app_state = Arc::clone(&app_state); + tokio::spawn(async move { + let app = Router::new() + .route("/create", post(create_achievement)) + .route("/delete", post(delete_achievement)) + .route("/ws", get(ws_handler)) + .layer( + ServiceBuilder::new() + .layer(Extension(app_state)) + .layer(Extension(app_state_watch_rx)), + ) + .layer( + TraceLayer::new_for_http() + .make_span_with(DefaultMakeSpan::default().include_headers(true)), + ); + + let addr = SocketAddr::from(([127, 0, 0, 1], 4000)); + + tracing::debug!("listening on {}", addr); + let server = axum::Server::bind(&addr) + .serve(app.into_make_service()) + .with_graceful_shutdown(async { + shutdown_rx.changed().await.unwrap(); + tracing::info!("Starting graceful server shutdown."); + }); + + if let Err(err) = server.await { + eprintln!("Server error: {err:?}"); + } + }) + }; + + // Wait for all tasks to finish. + let _ = tokio::join!(server_task, save_task); + + // Save final app state + tracing::info!("Writing app state to disk."); + let lock = app_state.write().await; + lock.app_state.write_state().await.unwrap(); + + tracing::info!("Shutdown."); +} + +async fn ws_handler( + ws: WebSocketUpgrade, + user_agent: Option>, + Extension(app_state_watch_rx): Extension>, +) -> impl IntoResponse { + let user_agent = if let Some(TypedHeader(user_agent)) = user_agent { + user_agent.to_string() + } else { + String::from("Unknown browser") + }; + tracing::debug!("{user_agent} connected websocket."); + + ws.on_upgrade(move |socket| handle_socket(socket, app_state_watch_rx)) +} + +/// Websocket statemachine (one will be spawned per connection) +async fn handle_socket(mut socket: WebSocket, app_state_watch_rx: tokio::sync::watch::Receiver) { + let mut stream = tokio_stream::wrappers::WatchStream::new(app_state_watch_rx); + loop { + let app_state = stream.next().await; + let serialized = serde_json::to_string(&app_state).expect("Failed to serialize app state to JSON"); + if socket.send(Message::Text(serialized)).await.is_err() { + tracing::debug!("Websocket client disconnected"); + break; + } + } + + tracing::debug!("Websocket context destroyed"); +} + +async fn create_achievement( + Extension(app_state): Extension, + Json(create_achievement): Json, +) -> Result<(StatusCode, ()), HandlerError> { + let achievement = Achievement { + goal: create_achievement.goal, + completed: false, + uuid: uuid::Uuid::new_v4(), + }; + let mut lock = app_state.write().await; + lock.app_state.achievements.push(achievement); + lock.watcher_tx + .send(lock.app_state.clone()) + .expect("watch channel is closed, every receiver was dropped."); + Ok((StatusCode::CREATED, ())) +} + +async fn delete_achievement( + Extension(app_state): Extension, + Json(delete_achievement): Json, +) -> Result<(StatusCode, ()), HandlerError> { + let mut lock = app_state.write().await; + if let Some(pos) = lock + .app_state + .achievements + .iter() + .position(|x| x.uuid == delete_achievement.uuid) + { + lock.app_state.achievements.remove(pos); + lock.watcher_tx + .send(lock.app_state.clone()) + .expect("watch channel is closed, every receiver was dropped."); + } + Ok((StatusCode::OK, ())) +} + +async fn shutdown_signal() { + let ctrl_c = async { + tokio::signal::ctrl_c() + .await + .expect("failed to install Ctrl+C handler"); + }; + + #[cfg(unix)] + let terminate = async { + tokio::signal::unix::signal(tokio::signal::unix::SignalKind::terminate()) + .expect("failed to install signal handler") + .recv() + .await; + }; + + // #[cfg(not(unix))] + // let terminate = std::future::pending::<()>(); + + tokio::select! { + _ = ctrl_c => {}, + _ = terminate => {}, + } + + tracing::info!("Shutdown signal received."); +} + +#[derive(Clone, Debug, Serialize, Deserialize, Default)] +struct AppState { + achievements: Vec, +} + +impl AppState { + /// Load. + async fn read_state() -> Result { + let file = fs::read_to_string(APP_STATE_FILE) + .await + .map_err(AppStateReadError::FileReadError)?; + let result = serde_json::from_str(&file)?; + Ok(result) + } + + /// Save. + async fn write_state(&self) -> Result<(), AppStateWriteError> { + let serialized = serde_json::to_string(&self)?; + fs::write(APP_STATE_FILE, serialized) + .await + .map_err(AppStateWriteError::FileWriteError) + } +} + +#[derive(Debug, thiserror::Error)] +pub enum AppStateReadError { + #[error("Failed to read the state file")] + FileReadError(std::io::Error), + + #[error("Failed to deserialize the state")] + DeserializationError(#[from] serde_json::Error), +} + +#[derive(Debug, thiserror::Error)] +pub enum AppStateWriteError { + #[error("Failed to write the state file")] + FileWriteError(std::io::Error), + + #[error("Failed to serialize the state")] + SerializationError(#[from] serde_json::Error), +} + +// TODO: still needed? +#[derive(Debug, thiserror::Error)] +enum HandlerError { + // #[error("Failed to lock state")] + // LockAppStateError, +} + +impl IntoResponse for HandlerError { + fn into_response(self) -> axum::response::Response { + let error_message = format!("{self}"); + (StatusCode::INTERNAL_SERVER_ERROR, error_message).into_response() + } +} diff --git a/crates/common/Cargo.toml b/crates/common/Cargo.toml index d184f24..275f276 100644 --- a/crates/common/Cargo.toml +++ b/crates/common/Cargo.toml @@ -5,3 +5,5 @@ authors.workspace = true edition.workspace = true [dependencies] +serde.workspace = true +uuid.workspace = true diff --git a/crates/common/src/lib.rs b/crates/common/src/lib.rs index 8b13789..09fe82d 100644 --- a/crates/common/src/lib.rs +++ b/crates/common/src/lib.rs @@ -1 +1,19 @@ +use serde::Deserialize; +use serde::Serialize; +#[derive(Clone, Debug, Serialize, Deserialize)] +pub struct Achievement { + pub goal: String, + pub completed: bool, + pub uuid: uuid::Uuid, +} + +#[derive(Debug, Clone, Serialize, Deserialize)] +pub struct CreateAchievement { + pub goal: String, +} + +#[derive(Debug, Serialize, Clone, Deserialize)] +pub struct DeleteAchievement { + pub uuid: uuid::Uuid, +} diff --git a/flake.nix b/flake.nix index 00d2ea4..5c5bce5 100644 --- a/flake.nix +++ b/flake.nix @@ -52,6 +52,8 @@ pkgs.taplo pkgs.fd pkgs.cargo-nextest + pkgs.xh + pkgs.websocat ]; }; }; diff --git a/justfile b/justfile index d8dcae1..ba250f7 100644 --- a/justfile +++ b/justfile @@ -1,5 +1,5 @@ _list: - @just --list + @just --list --unsorted # Check project check: @@ -16,3 +16,14 @@ fmt: just --unstable --fmt cargo fmt taplo fmt `fd --extension=toml` + +run-backend: + RUST_LOG=debug cargo run -p backend + +# POST /create +create-gul-bus: + xh post 127.0.0.1:4000/create goal='pej på en gul bus' + +# ws:///ws +subscribe-ws: + websocat ws://127.0.0.1:4000/ws diff --git a/rustfmt.toml b/rustfmt.toml new file mode 100644 index 0000000..136ae47 --- /dev/null +++ b/rustfmt.toml @@ -0,0 +1,6 @@ +version = "Two" +unstable_features = true +group_imports = "One" +imports_granularity = "Item" +max_width = 110 +use_field_init_shorthand = true